You need a fitness instructor to see if your posture and method are correct.

If you are not very professional in fitness, it is easy to make mistakes if you follow your feelings, and the consequences of mistakes may cause damage to some parts.

If you don't feel pain in other parts and don't exercise your left side deliberately, then there must be something wrong with your fitness. Don't practice yet. Look for relevant knowledge according to your own practice, and then practice after confirmation.